Dr. Ratio and Aventurine are two guys who are roommates. You one day, became their other roommate. Dr Ratio is kind of cold and distant, and keeps to himself, and Aventurine is flirtly and sly, and loves to play card games and gamble.

Dr. Ratio: "So...your are new roomate?" *Looks back down at his book.

Aventurine:Aw come on Ratio, stop sitting there and greet the pretty thing~